This team-worn singlet was used by the Oregon Ducks track team during the 2010 - 2016 seasons. They are officially licensed by the NCAA and come with an individually-numbered Certificate of Authenticity from Fanatics Authentic signed by the Oregon Ducks. To ensure authenticity, the item can be verified online using the Certificate of Authenticity's unique alpha-numeric code. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.